Stable perborate mixture yielding hydrogen peroxid.



STABLE PERBORATE MIXTURE YIELDINTG HYDROGEN PEROXID.

No Drawing.

Specification of Letters Patent.

Application filed March 4, 1911.

Patented July 4, 1911.

Serial No. 612,199.

To all whom 'bt concern:

Be it known that we, AUGUST KLAGES and FRITZ SoMMER, both subjects ofthe German -Emperor, and residents of Salbke-Westerhiisen-on-the-Elbe,in the Kingdom of Prussia, German Empire, have invented certain new anduseful Improvements in Stable Perborate Mixtures Yielding HydrogenPeroxid, of which the following is a full, clear, and exactspecification.

Our invention relates to the production of stable perborate mixturesfrom sodium perborate and a solid acid salt,which mixtures will yieldhydrogen peroxid on coming in contact with water. The efficiency of thesodium perborate as a .disinfectant in an aqueous solution is due to itscapability of being-dissociated into hydrogen peroxid and boric acid.Since the sodium perborate is not readily" soluble and is only partiallydissociated, its full efliciency can be attained only by liberating thehydrogen peroxid from the salt by adding diluted acids. Thisdissociation has been obtained heretofore by the addition of phosphoricacid or of acid salts to the aqueous solutions of sodium perborate. Orit has been accomplished by adding to water a mixture of a perborate,con taining a lesser quantity of water of crystallization thancompletely hydrated perborates, with solid acid substances. The mostsatisfactory and stable perborate is the granular crystallized saltsodium perborate of the formula NaBO,|-4H,O, said salt containing 10.4%of activeoxygen.

It is the object of our invention to produce stable mixtures of thissalt, which mix -tures on coming in contact with water will yieldperoxid of hydrogen. We have found that for this purpose the readilycrystallizing sodium acid salts of the sulfobenzoic acids, C HACOOH). SONa, which are remarkable for their pure acid taste as well as theirharmlessness and easy solubility, will form non-hygroscopic, stableixtures with the crystallized sodium perbor te. In

an aqueous solution such mixtures decompose to yield hydrogen peroxid,boric acid and sodium sulfo-benzoate.

Example: Mix 10 kg. of crystallized sodium perborate with 14.6 kg. ofsodium acid sulfo-benzoate, and grind to form a fine powder. If 12 gms.of this mixture be dissolved in 100 ccm. of water, it will correspond toa 1% solution of hydrogen peroxid, and which solution will at the samtime contain 1.8% of boric acid.

We claim 1. As a new composition of matter, a mixture of a crystallizedperborate with an acid salt of a sulfobenzoic acid, substantially asdescribed.

2. As a new composition of matter, a mixture -of crystallizedsodiumperborate with an acid salt of a sulfobenzoic acid,'substantiallyas described.

3. As a new composition of matter, a mixture of 10 parts crystallized,finely ground sodium perborate with 14.6 parts of finely ground sodiumacidsulfo-benzoate. Y

In testimony, that we claim the foregoing as our invention, we havesigned our names in presence of two subscribing witnesses.

AUGUST KLAGES. FRITZ SOMMER. Witnesses:

HENRY HASPER, WOLDEMAR HAUPT.

